<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            display: flex;
            width: 60%;
            height: 200px;
            background-color: skyblue;
            margin: 0px auto;
            flex-direction: row;
            align-items:flex-end;
        }
        span{
            /* 把span平均分成三等份 */
            width: 100%;

        }
    </style>
</head>
<body>
    <div>
        <span>1</span>
        <span>2</span>
        <span>3</span>
        <span>4</span>
    </div>
</body>
</html>